document('') is not a supported syntax. The argument is supposed to be a
URI reference, and the empty string is not a valid URI reference.
In any case, I suspect that using document() to access the current doc --
whether explicitly or via the empty string -- is inefficient compared with
simply starting your path with /, so I would recommend you avoid it if
possible. (If your XSLT processor doesn't cache documents indexed by URI,
it might involve re-loading a second copy of the doc. If it does some
caching, you still have to take the time to expand th URI and consult the
cache rather than doing a simple tree-navigation to the root.)
Is there a reason you're trying to use document() rather than /?
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Joe Kesselman / IBM Research
